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Cushion|Natural|GIA

1.50ct I SI1 Cushion Natural Diamond

ID • I/SI1 • GIA 1545301815

Certificate GIA 1545301815

Diamond specifications and retailer prices

From £1,758 GBP
HK$18,400 HKD
As of November 1, 2026
Save £2,113 GBP (55%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £3,871 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.5ct natural cushion diamond

This 1.5ct natural cushion sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1545301815. Listed at 21 retailers as of November 1, 2026, with prices from £1,758 to £3,871, a £2,113 spread on the same certified stone. MOH London lists it at £3,871. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.50
Carat
I
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38°
Pavilion angle35.9°
OriginNatural
Grading LabGIA
CertificateGIA 1545301815
Dimensions6.47 × 6.44 × 4.41 mm
L/W Ratio1.00
Girdle conditionFaceted
Top View
6.47 mm6.44 mm1.50 ctI / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1545301815
Side View
Table 64.0%Crown 38°Girdle: MED-STKPavilion 35.9°Culet: NoneDepth 68.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £3,871 GBP|Low: £1,739 GBP|High: £3,917 GBP|Avg: £2,301 GBP|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 15£1,758 GBP
Retailer 5£1,774 GBP
Retailer 16£1,841 GBP
Retailer 9£1,878 GBP
Retailer 7£1,935 GBP
Retailer 6£2,056 GBP
Retailer 19£2,067 GBP
Retailer 4£2,091 GBP
Retailer 8£2,096 GBP
Retailer 2£2,196 GBP
Retailer 3£2,202 GBP
Retailer 17£2,202 GBP
Retailer 18£2,276 GBP
Retailer 13£2,418 GBP
Retailer 10£2,473 GBP
Retailer 12£2,709 GBP
Retailer 11£2,744 GBP
Retailer 14£2,845 GBP
MOH London£3,871 GBP

28 data points across 19 retailers

21 retailers£1,758 GBP to £3,871 GBP

A
Cheapest Retailer
-
£1,758 GBP
HK$18,400 HKD
A
Retailer 2
-
£1,774 GBP
$2,377 USD
View
A
Retailer 3
-
£1,841 GBP
$2,467 USD
View
A
Retailer 4
-
£1,878 GBP
$2,516 USD
View
A
Retailer 5
-
£1,935 GBP
$2,593 USD
View
Final sale: no returns
A
Retailer 6
-
£1,941 GBP
A$4,001 AUD
View
A
Retailer 7
-
£2,056 GBP
$2,755 USD
View
A
Retailer 8
-
£2,067 GBP
$2,770 USD
View
A
Retailer 9
-
£2,091 GBP
$2,802 USD
View
A
Retailer 10
-
£2,096 GBP
$2,809 USD
View
A
Retailer 11
-
£2,196 GBP
View
A
Retailer 12
-
£2,202 GBP
$2,950 USD
View
A
Retailer 13
-
£2,202 GBP
$2,950 USD
View
A
Retailer 14
-
£2,276 GBP
$3,050 USD
View
A
Retailer 15
-
£2,418 GBP
View
Retailer 16
-
£2,473 GBP
A$5,097 AUD
View
Price last confirmed 25 days ago
Retailer 17
-
£2,687 GBP
$3,600 USD
View
Price last confirmed 10 days ago
A
Retailer 18
-
£2,709 GBP
€3,457 EUR
View
A
Retailer 19
-
£2,744 GBP
$3,677 USD
View
A
Retailer 20
-
£2,845 GBP
ZAR 61,581 ZAR
View
Most Expensive
B+
MOH London
64A723D81 · Nov 1
£3,871 GBP
View
20 more retailers have this diamond
Prices start from £1,758 GBPSave up to £2,113 GBP

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.50ct Cushion
£1,758 GBP